Automatic centering instrument



Jan. 29, 1963 A. J- STREcKER- AUTOMATc CENTERNG NSTRUMNT Fi1ed A ri1 28 1961 Jnited StateS Patent o 3,075,294 AUTMATIC CENTERING INSTRUMENT A11Ted Jl s1reckeT, CTanoTd, NJ. (9 Barker Rod, SomeSe1, NJJ Filed Apr. 28, 1901, seT. No. o,z97 1 Claim. (CL 3318) This 1nvenon Tolates o an a11tomatic inStrnment foT 1ocaTing and marking the top dead cener of n1ate1 i a1 to be subSequently d rilled. one object 'amtained by the inven tion is the pTovi Sion of a precision instrun1ent of sim ple construction.

AnotheT feoture o the inStT11111e11t 1S that it also funo OnS as a scriber.

T11e dTaWingS 11111STa tethe invention, and in theSe:

FIGURE 1 showS he ins1Tument, m-ostl i11 vertical section, and applied to a cylinde1 to be 1na1kod FIG. 2 is an elevational vieW; and

FIG. 3 shows a vertioany 111ovable dTiH p1oss chuck, 1ho ins1ru1nent theroin, and a holding v-bloCk and a cyHnde1 theroo11 which is to be ma1ked by the instrnment.

T11e instrument oompT1Ses a s1eeve s, the uppeT end of which iS closed by a cap o which thToadedly engages the inne1 SUTface of the sleeve. A tube 7 1itS SHdab1y in the sleeve and itS uppe1 end iS closed by a ot headed oap 8 111 a manneT Similar t() cap 0. A headed, poin ted maTkeT 9 11ts Slidably into 10be 7, and is adapted to extend theTe- 1)elow 10 contac1 and ma1 k he w01k, the head o f the Inarker Tes0ing, in itS lowest position, 011 a11111teTnal 3110111- der With4i11 the tu'be. A coiled sp1ing 10 is placod Within 1he sleeve, be1ween the ca s 0 and 8, and a coiled s rin 12r is dispoSed 1 1/1thn tube 7, betWeen the uppe1 end of tho ma1keT 9 and the cap 8. proieoting pin 15 iS ScTowed into the Upper end po tion of the ma1keT fo1' the purpose of Inanipulating the Same, and eXtends at Tight angleS 1heTeto through Tegiste1ing veTtical s10S 17 foTmed 10- pectivo1y i11 he tube and sleeve. T he slots a1e tecesSed lateTally ot theiI, up e1 end to forn1 a ledge 18 on Which in 15 ma rest after a sn1a11an ular turnin in its u eT- 1n 0St )0sitio11. An annUlus 20 11ts slidabl around the lower popti011 of ube 7 -a11d 111ay be adju0tably secured thereto by a set SoTeW 21. A pai1 of opposed, ot, Wo1k contacting 1ingeTS 22 eXtend ontwardI and dovvnvvardly, at equal angles, fron1the annulus, being at Tigh1 angles to ea0h o1he1, With the oiI1ted end 01 the nla1ke1 9 halfway botween. As show11 in FIG. 3, a piece of work in the fo1n1 of c 1indeT 25 is lace h rizontaH on a -b o k 00.

3,075,294 Paten1ed Jan. 29, 1963 The instrument iS held veftica1 by clan1p1ng 1he Sleeve 5 111 the chuck 27 'of a dr111 press 28. The p1ess is then opepa1ed to lower the inSt1ument 1111011 both o the ngerS 21 i11St to11ch -the cyHnder. The ma1ker having been pTe vioI1S1 1aiSed b means of in 15, vvith the latte1 restin on ledge 18, the pin iS pushed o the ledge, WhereUpon 1he rapid eXpanon of -the 1nentioned spTingS, Which aTe made strong, dnve the In aTke1 do Wn so that it indents the cy1indeT at dead top center. To Scratch a line on the Tod 15, 1he marker TemainS down and the Vblock and rod are n1oved along 1he table 30, the nlaTker thereby acting as a soer. The uppeT spTing 10 aotS aS a shock abS01ber t() p1event the maTke1 co111ing down o hard when the pross loWers the inst111nlent onto the W01k. This Spring and he 01eeve may 'be dis ensed with if des11ed. To drill in10 the Work, the instTuInent is taken o11t of the chuck and a drin substi tuted, by Wh1ch a Tecess o1 hole is made i1:1 the true direc1ion.

what is olaimed is= An i11Strunlent of the charaoter deSoIibed, compSing a SIeeve ad ap ted fo be held ve11icaHy in a ver1ically movoble chuck, a tube 1itting s1idably vvith'in 1he Sleeve and extending theTebelow, a pointed n1a1ker Slida bly 1itti11g Within Said tube and adapted t() extend therebelow, fhreaded caps closing the uppeT endS of Said SIeeve and tube, a 11Tst co1led s rin vvithi11 said tube and dis osed 1)etvveen the upper end of said 111a.rker and the tube cap, a Second coiled spring Within Said sleeve and disposed be 1vveen said caps, a pin secu1ed to said n1arker and extend ing laterally throngh Sa1d tube and sleeve, the two 1a tter membeTs having 1egiStering Slots through Which Said pin may move and a pa of o oSed, Wo1kcontacting nge1s extending at equal angles ouard1y and downwaTdly fron1, and adiUStably secured to, Said be, the pointed end of Said n1aIkeT be111g Inidway botv7eeI1 the -wo1k0011 1acting ngers.

11eferences Cifed in the 11le of this patent UNITED STATES PATENTS 726086 McAl ine A T, 12, 1903 863 909 Evans Au 20, 1907 063,342 Ekman 1tlne 3, 1913 22Z0,9Z3 Trillin Nov. 12, 1940 2,847,765 Batem-an Au 19, 198

FOREIGN PATENTS 44 902 GT at B i o t. 18 1950 

